SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a36ab213995ab27d7d550dc3c1f85c09a85114f9988c45807d437351949f46' 
  AND token = 'KGRC2xIvz1nmgJUab2L5uTWC3H7sifBBLiNYOG9dXBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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