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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a1b925dfe67f75b380d2e47978737d00e04c2599bc453493797ad78ecd54ea' 
  AND token = 'Chh7Yn8x3iRXd2ibXrzUdunIZ3bs7g+EZrTQ7csq+YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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