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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410d9ff4dab33bbeb0491553cf9a6a763ba23295fec9c1508b1d58475caa0c24' 
  AND token = 'scrTUI5ZMJF9+WrhuKHOgiNUFs11ZXZQ86veNMnP6eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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