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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cb41e856232b2b8e0a49d1a794a768ae1e34aa889a9ce275f8b0c63439ef95' 
  AND token = 'nJq6NPLlsZ15AzsOIPnmrFkDGMEhX+Nnd//+bZnsKl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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