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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774140ded238bac491266f137703ae1dc3f2c851e1d434e07039ab15ec1e60a5' 
  AND token = 'FTLPmzpJUexK2yPdSbAuk3AF4Slh8r4fnUw1Oykwy+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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