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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc7f19f8d4e743ea63d1ea61896817a7ca28bea20598963460883908a09ac10' 
  AND token = 'TtC26TG44cwzpCVMjGFpUIDRsk2F7g89zQdG3b9sIN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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