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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c855344c61dd68d41f7126cebe9a243fc4fdcff1f7ffeb814fa010e1508b30' 
  AND token = 'jXv5WC8Uj7fJbsPYrtL+EpxdnXzOvoZ5j5bvhMMIb4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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