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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05f8a2ae4afac97bc6dd87a9b8b1c09aebc4eeaa5af10648aacd5769cd92b00' 
  AND token = '9M5lPk7NloMYb2C9ps2WunjNu20/OJgBOe9PoPEcs5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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