SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85069b2c0faab295213295073f5b6263767b9401e9084dd70701f3b6a1d622a8' 
  AND token = '1MYIJYvoQSCYoh0VVoOsBoqz5EIgRmFPQcT7pjiyoVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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