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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b94317f170fab1d2bcb7ef6ad004232270b5eb5cd21dffc6cbaaf3dfb6ac8a' 
  AND token = 'p7SdUEwt400efqRUate216HoNy0LnpcPz/KK+voC7Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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