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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb8ece8ef55e5d646c5dd02c960d1b328f575b7a942f1696fcc34b0fdbeaaf5' 
  AND token = 'onNJonXAlPFUfRQPMsCMaLLVDXci9gFkAQ6A6OdR7mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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