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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e790e63273b5d9f35577eb3423159ef91ffb7203a8dfd75b7f745eb8491f7af3' 
  AND token = 'JBC/DEz3DEEq0mjaeclpw9vndOH986hZbdTD/zyp210=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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