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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c389817abbc63e4c13efa552ab3fc63722cbc5c4b512ef1844ff45b9a7e8e35' 
  AND token = '3Ev4B7t58CT528AvoMjr2BJVkndNHhI2wHQrsXwwKvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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