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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5824bc7d7e2ba3db34e5d4f3379c49272ddced1b6151ae7d430ed067869aba' 
  AND token = 'P5XH4XILRk0AsCJ+Uq3nxyBZPeegdhFQ7Ay75xmFZw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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