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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c459c3f5c4580be2c913c5ddbee7b5119340e611b485ca5490663f444b599ca' 
  AND token = 'NQ4IYDvAcjdYzi40EqLs6MFwBIQcJ/r9ZBQI/0+P2PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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