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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06da9f817757b4cd9531de19ee1f268ce6169308454e7ae3f171c21cac1f74cf' 
  AND token = 'LxkAwYGIRBTaW0qZ92Vg9U7VnRq46ewJZpp5hflgNbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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