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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703ddcd29c8dffd538fc492bec13e5a3a7d00082ec0eb5951fffc78bf1072cc0' 
  AND token = 'ReXU2nHZHDo6hIo0aVTRo50E9fU+9KprtswLqKUvwxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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