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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39255c3ed3982226abf16c2b4e5e55273d562f2f75c17642ed500a0bbab3f127' 
  AND token = 'vMiJCE/F7qIccMbbq6teJCH6/iSk+H4ivmCWGa33utE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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