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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2436fc92994b6dd634febeb19dca25d885c45762db8746482c3c40d106f7e4a6' 
  AND token = 'Hk1Z0koLf8/C94wNnIMJxlTwy8Ta2a6xEGkXU+cbtsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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