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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57493bf9ab8d9df56680d2d98f92ccb66b5ff8df7bad054e60306a552a05960f' 
  AND token = 'fHw95q9qbdrgbaZsvTihuR/Jvr6xaXs7KkSHjJOj+xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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