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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff17b111544163a4a48af4ae1366dd0ddf260b8f2d087bc4972f01eee67b87b' 
  AND token = 'D7e9DSJO5vbaLKLTye0AknyH18DV+CPUvYl9SO0Q9dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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