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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadcea31f4c86ab76e61c821d88c27f59989c01db5dd062b35a303e7bcd8609f' 
  AND token = 'cQkpG8G8dWG4WDBGcFox/Md2O/XB4QcgiP8ZlNvS+NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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