SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f33cc93d925b22ea756c85214afcff167d00f8f917c85079df68e9d0a258598' 
  AND token = 'y/uLYzsPH33Z7vFCEByA4/fQjPyCZ0RGLOQwWRX2KDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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