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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c8ebb6805d4e7b0ede40e530ef9dcc83c546fce7eb8ab6bfef8510a4955dc3' 
  AND token = 'XF1FEx2W0oNDLTQ1MkS8deBTgoSUoYE17+whTlD5jbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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