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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089fa6346cdcf83f7c6a4c2385e93399985a1458534e6ee38f2e348e56f30112' 
  AND token = 'yTdfIjTkz+P8ekRXVQcUiCO+4SXoG6H4RQOzqyhk/IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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