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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ebb8269111a3bfe1179f200e7d59a3da873f8335990bf92cc58b8653c33f61' 
  AND token = 'p/IuH1UyyvsEw0eMQKwS5unN8Bh+qwDBxtKJPkf5zP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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