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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2ebb422a0e80984f796f11fe1e5119902958deb18d9e02bcb016652c7f782d' 
  AND token = 'faQ9fBv7uG1wST+DZsDvN9aFDOMrfyFuScmN0sP4v6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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