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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7a5d6bb4844b9349d1bbdff04e6b71c923573b06a7083576d9dc4d62d43841' 
  AND token = 'ta82FHU53hr9jhweoZFXJi9zIdeoxXD0XtIs9qhmmuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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