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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e856ab622146b204ebc230c253971bd4785f7840e44141157dc6d1f33cb68cb' 
  AND token = 'tOOt8drgJSb7x1gmIaI/5ZKboKDL32OIZv8YqRjld+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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