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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98caccd15a972f2d749d53844b315d2fd47c22bc297bbb6804639be413118386' 
  AND token = 'sEz3iRdrf14sTqqQbULqVPg4Y8kH+mEZ+9svmqAsDX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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