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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdb418abf0940ca204327ff29c0572a27cc47a72ec2a29c4f5caadf8be0820f' 
  AND token = 'yc7I+DynQja9qt2Vza0NwLRed8qsD3ryEJVrcUdzpzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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