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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250939734c34a280862d58db99f4d13e81a3ec16a4124cea869b6d15a6fe4038' 
  AND token = 'Mh18T1embQWjv3rfyxezue9S956hkM+J4jzoUqSOPI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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