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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b523a8614e1100a2a847d6253579e37ada0365ab42d9408dc22553ee69d099d8' 
  AND token = '3CZ5KcSc9oHYPNsOWef22gDaf8h4SuEbWgQeuJyqaOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}