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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ea4dea9f64882c2b1fbeb2c4cab4bc51ddf4db5cc452e2bdbb51757273c9d6' 
  AND token = 'SQ1TXoGKatt81HhjSv08Sl2T3AuhlJM3zhErnUc1eEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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