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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfb3d66733d9e6ab4e034d1ea890f119704e5aa085d2f3a9ed1de0586a6a619' 
  AND token = 'vJhq6/xyeTyppc16+BAjcNM3P6UioK+Wei+E5JFSuLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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