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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20700a5c9e3846b35dcc6cfcb7e73b66be3b38996f36c7d9e9960fab68efbe76' 
  AND token = 'mOo7YSv7tO8ZcEWVb2pPjauyqoIHHFy/jZgv1a41eCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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