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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7311c4ecc9c31757cd6e90a9f7112286858d0d914a39b8bff8ffa4a394ec62b' 
  AND token = 'UwvIctVzSWmsk/IlBAeUHM44O3eix9uwul7XfkOrZhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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