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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edf4e0d7759fd4cb132beb8d5e2bb85e731fd31e690fce2787514ded0bab6a3' 
  AND token = 'ENXSCI7JHGG8O9OHRlj4bafmJh2kFfrSqHg02rmD5tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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