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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f39e2e3ba210bb65e4a2e69f677dbc5f98188a778f4d70e5bf841ae8453cc7' 
  AND token = 'hjpvTz71APTmWBTuBRzqLnTqw0Y028OaFB7kovi9vkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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