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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62508316894bbd6b2e367f95a4cf9e260c185483fae5cb936de01d1b38c627d1' 
  AND token = 'RZW+bHpFWs6npZWvcr85ZS64l9Y5IIAzTDSl0r30a4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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