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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c4f7cdc45774b9d7884ea780874a60b49ec9c18277cd7a2458e4212b52afee' 
  AND token = 'vyqa3qbXrw6jxG1NWG3vW5k/Wdakikut8a0G90eJFkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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