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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0cc844d336de1fadc1e862853d5c9307ecfa742233c4310ed4c7e9ce7c3193' 
  AND token = '0/OL71rq+nMxvgw7wUjRUZAwDkT4Xq4RRqW9jOC08B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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