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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbf84437dc6ff140d7f78d358eaa66e402b830f9bfcef1f991e3bf898347cbe' 
  AND token = 'l/DgwiNpRNQ4qpx6f6w3wK45MkVq3DZB95d5/kpLziw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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