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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c614c9f6b58b3f00b39480f2b71b5da9dad63a87581224289fd96afaa1629046' 
  AND token = '+XHghEa2JmkuNjZQNg0/OVM1xXt2t8gOgmwrxSiNSqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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