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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2414aba5b209e49a3a1d297fd71e3ab69331b56cda11cc9f44ce851820b7664c' 
  AND token = 'Rh5EDto+miJx/298PqyE5r2JyEU7Ax4qunJ0+zqKpSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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