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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76571fb234ef192e05258c6e7349203084a394354899f3b3ca409ba20ba0a7b6' 
  AND token = 'C97oU8XR+evEddsUxDb5d1CyiF86Fg1mUQflofjBwDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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