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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbd043e1326f3ddf2ba9faf703e2f1ab217fea9e243a44e948c7d5af375c99b' 
  AND token = 'Chg3eLLFSMhHXZ/2rBH52UcevHwvlmzd2hbux1IW9Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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