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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3e78785e8b466b0216c327b5c8d89907f052cc8079a25a15fca689a8271b7b' 
  AND token = 'o9xW2WyT0ZlSGE1TbgZGFd4dtZnuvo6Hst4fjbcgZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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