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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e34eeda3bc284372a7573f641b5e905b399b90bbcdc4a191c29026d323ce13' 
  AND token = '2/g/DK9Mw4te74lOq2chIPYWdvNqFjLdOY15jNnZOJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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