SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2563046bbd3c79dac0c846a5b693dd130cb0071f39d22084e720dd2aacf972' 
  AND token = '7NDcBlKocSWjuPfvXtG+vqgRq92MVTKJUYdSON57mtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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