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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3fb140a7c1149d23d4c6006a722ec164019b31bae8a4a5d1adfa58737a8f91' 
  AND token = 'YYqNRIXbgp2TpaEGNnIfXo8b7gMekXg0HEnBaY3FtUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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