SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767d854c47df092f71a0c1c4d17f7feb355a2431b95110db509e10bb8e79cc9b' 
  AND token = 'brJ2n/K8yuWYx3uvphP6BXjKZLICCLlvrhN7o9CyajA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00209

JSON explain

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