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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54084c9a5c5438f18c6b92c6a3b9368cec994f7ee5a10275bd625611ac3d18c8' 
  AND token = 'slrKDFaF+cqz8ZAqSTEGxWljAeUke4FHCIH1ADXqu9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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