SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd47ac8a826b4bf2b5d0ecaa08455c1c7c193c764dcec641a1f0dc4bba9d575' 
  AND token = 'P+3o7Em/gVLAhWOl+BuGV6aJ20pjjndwXUqnTG4HvXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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