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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbb6fe66b9bd8114a0111092bd4ac85e95ff41b40891948c92bace95849a516' 
  AND token = '+zA8EEUps0VfqE6dJnH3/Ehc9vN6pr5rnysgqkXSpFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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