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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edab4a83dbd695c146ecce567822f15b8f9a3d83457c2f86029ac130a9462254' 
  AND token = 'bfgI+Jzg7Fb3HXbS5XiHdop7+yS/Qt6KinJD9xlUw8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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