SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd35ef22699a7f4fc08b3cdc83d191d31b8651e9d784cf2462ff669419cae3d' 
  AND token = 'aqbgl/asnqPH1DTsnVOzetxrYK0vATtTIYef7HZjZ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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