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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fe235520ce4d5696ae7fde01168af782d510a5b457a199ce7cd36f99f04ed3' 
  AND token = 'ps3lvTrpfMltnZAz6ZzIQxc29ptgqi3raIq4Pr71K5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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