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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c894033cb7d5dd43f19d24623bbe85f61b0bf7d76ce86fcd5f0ab501b41f58' 
  AND token = 'FD9a96b71QctTuYe+knC6X+iNYTTQKgoNm9+ce3Z6Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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