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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c3ee698c2d6e5ad4d8d28895b14843cb512d840c66e4e30fec3973259cc29f' 
  AND token = '25nHiKbdRH9jWWphEvDG75pyLGpoH5L60YJfg7UIYZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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