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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f8e55dfda354daded19122b6fa3ef6443a2550d35db89b291978fca6ad1e3e' 
  AND token = '8E9cwbknHqwEV6E39DUdlmDnbaLr2qelUpr0/zU8BCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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