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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35688db2a95a683e6c66be3b15d2f4af40203449b2d7229a52ad35ea6dd9253' 
  AND token = 'F9IAEM0KzATiO2y+LrK3V/483VBuJ9gmIO5AQ6x/v5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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